Troubleshooting Hints - Interior Lights Dimming

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. If only one lamp does not operate, check bulb, socket and related wiring (see schematic).
2. Check I/P Fuse Block INTERIOR LPS Fuse 8B, RADIO Fuse 8D, and MISC/RDO/CLSTR Fuse 9C by visual inspection.
3. Check that grounds G101 (Oldsmobile and Pontiac), G101, G201 (Oldsmobile and Buick), and G202 are clean and tight.
4. If all VF displays are inoperative, repair open or short to ground in CKT 43 (YEL).
5. For Pontiac, if all incandescent lamps are inoperative and VF displays do not dim, but park lamps operate properly, repair open or short to ground in CKT 32 (YEL).
6. For Buick, if all incandescent lamps light, but do not dim, replace the Remote Dimmer Module.
7. For Oldsmobile, if all incandescent lamps light, but do not dim, replace the Panel Dimmer Module.
8. For Pontiac, if all incandescent lamps light, but do not dim, replace the Headlamp Switch.
9. For Oldsmobile and Buick, if HVAC VF displays are inoperative or do not dim, repair open or short to ground in CKT 724 (PPL/WHT). Repair open or short to ground in CKT 724 (PPL/WHT) (Oldsmobile and Pontiac) or CKT 835 (DK GRN) (Pontiac).
10. For Pontiac, if HVAC VF displays are inoperative or do not dim, repair the open in CKT 32 (YEL) between the Heater and A/C Control Assembly and 5234.
11. Before component replacement, check for poor connections at related component and in-line harness connector terminal connections.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.